/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 3
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// net_wins.c

#include "quakedef.h"

// statically link to winsock
#pragma comment (lib, "Ws2_32.lib")

extern cvar_t *hostname;

#define MAXHOSTNAMELEN		256

static int net_acceptsocket = -1;		// socket for fielding new connections
static int net_controlsocket;
static int net_broadcastsocket = 0;
static struct qsockaddr broadcastaddr;

static unsigned long myAddr;

#include "net_wins.h"

int winsock_initialized = 0;
WSADATA		winsockdata;

//=============================================================================


BOOL GotLocalAddress = FALSE;

DWORD WINAPI GetLocalAddressProc (LPVOID lpParameter)
{
	struct hostent	*local = NULL;
	char			buff[MAXHOSTNAMELEN];
	unsigned long	addr;

	if (gethostname (buff, MAXHOSTNAMELEN) != SOCKET_ERROR)
	{
		EnterCriticalSection (&qCS);
		GotLocalAddress = TRUE;
		LeaveCriticalSection (&qCS);
	}
	else
	{
		local = gethostbyname (buff);
		EnterCriticalSection (&qCS);

		if (local != NULL)
		{
			myAddr = *(int *) local->h_addr_list[0];

			addr = ntohl (myAddr);
			sprintf (my_tcpip_address, "%d.%d.%d.%d", (addr >> 24) & 0xff, (addr >> 16) & 0xff, (addr >> 8) & 0xff, addr & 0xff);
		}

		GotLocalAddress = TRUE;
		LeaveCriticalSection (&qCS);
	}

	return 0;
}

void WINS_GetLocalAddress (void)
{
	if (myAddr != INADDR_ANY) return;

	// because this can take some time we run it in it's own thread, keeping the program responsive
	// while we do do.  per MSDN advice not to use a blocking hook.
	GotLocalAddress = FALSE;
	QueueUserWorkItem (GetLocalAddressProc, NULL, 0);

	while (1)
	{
		EnterCriticalSection (&qCS);

		if (GotLocalAddress)
		{
			LeaveCriticalSection (&qCS);
			break;
		}
		else LeaveCriticalSection (&qCS);

		Sys_SendKeyEvents ();
	}
}


int WINS_Init (void)
{
	int		i;
	char	buff[MAXHOSTNAMELEN];
	char	*p;
	int		r;
	WORD	wVersionRequested;

	if (COM_CheckParm ("-noudp"))
		return -1;

	if (winsock_initialized == 0)
	{
		wVersionRequested = MAKEWORD (1, 1);

		r = WSAStartup (MAKEWORD (1, 1), &winsockdata);

		if (r)
		{
			Con_Printf (PRINT_SAFE, "Winsock initialization failed.\n");
			return -1;
		}
	}

	winsock_initialized++;

	// determine my name
	if (gethostname (buff, MAXHOSTNAMELEN) == SOCKET_ERROR)
	{
		Con_Printf (PRINT_DEVELOPER, "Winsock TCP/IP Initialization failed.\n");

		if (--winsock_initialized == 0)
			WSACleanup ();

		return -1;
	}

	// if the quake hostname isn't set, set it to the machine name
	if (Q_strcmp (hostname->string, "UNNAMED") == 0)
	{
		// see if it's a text IP address (well, close enough)
		for (p = buff; *p; p++)
			if ((*p < '0' || *p > '9') && *p != '.')
				break;

		// if it is a real name, strip off the domain; we only want the host
		if (*p)
		{
			for (i = 0; i < 15; i++)
				if (buff[i] == '.')
					break;

			buff[i] = 0;
		}

		Cvar_Set (hostname, buff);
	}

	i = COM_CheckParm ("-ip");

	if (i)
	{
		if (i < com_argc - 1)
		{
			myAddr = inet_addr (com_argv[i + 1]);

			if (myAddr == INADDR_NONE)
				Sys_Error ("%s is not a valid IP address", com_argv[i + 1]);

			strcpy (my_tcpip_address, com_argv[i + 1]);
		}
		else
		{
			Sys_Error ("NET_Init: you must specify an IP address after -ip");
		}
	}
	else
	{
		myAddr = INADDR_ANY;
		strcpy (my_tcpip_address, "INADDR_ANY");
	}

	if ((net_controlsocket = WINS_OpenSocket (0)) == -1)
	{
		Con_Printf (PRINT_DEFAULT, "WINS_Init: Unable to open control socket\n");

		if (--winsock_initialized == 0)
			WSACleanup ();

		return -1;
	}

	((struct sockaddr_in *) &broadcastaddr)->sin_family = AF_INET;
	((struct sockaddr_in *) &broadcastaddr)->sin_addr.s_addr = INADDR_BROADCAST;
	((struct sockaddr_in *) &broadcastaddr)->sin_port = htons ((unsigned short) net_hostport);

	Con_Printf (PRINT_DEFAULT, "Winsock TCP/IP Initialized\n");
	tcpipAvailable = TRUE;

	return net_controlsocket;
}

//=============================================================================

void WINS_Shutdown (void)
{
	WINS_Listen (FALSE);
	WINS_CloseSocket (net_controlsocket);

	if (--winsock_initialized == 0)
		WSACleanup ();
}

//=============================================================================

void WINS_Listen (BOOL state)
{
	// enable listening
	if (state)
	{
		if (net_acceptsocket != -1)
			return;

		WINS_GetLocalAddress ();

		if ((net_acceptsocket = WINS_OpenSocket (net_hostport)) == -1)
			Sys_Error ("WINS_Listen: Unable to open accept socket\n");

		return;
	}

	// disable listening
	if (net_acceptsocket == -1)
		return;

	WINS_CloseSocket (net_acceptsocket);
	net_acceptsocket = -1;
}

//=============================================================================

int WINS_OpenSocket (int port)
{
	int newsocket;
	struct sockaddr_in address;
	u_long _true = 1;

	if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
		return -1;

	if (ioctlsocket (newsocket, FIONBIO, &_true) == -1)
		goto ErrorReturn;

	address.sin_family = AF_INET;
	address.sin_addr.s_addr = myAddr;
	address.sin_port = htons ((unsigned short) port);

	if (bind (newsocket, (sockaddr *) &address, sizeof (address)) == 0)
		return newsocket;

	Sys_Error ("Unable to bind to %s", WINS_AddrToString ((struct qsockaddr *) &address));

ErrorReturn:
	closesocket (newsocket);
	return -1;
}

//=============================================================================

int WINS_CloseSocket (int socket)
{
	if (socket == net_broadcastsocket)
		net_broadcastsocket = 0;

	return closesocket (socket);
}


//=============================================================================
/*
============
PartialIPAddress

this lets you type only as much of the net address as required, using
the local network components to fill in the rest
============
*/
static int PartialIPAddress (char *in, struct qsockaddr *hostaddr)
{
	char buff[256];
	char *b;
	int addr;
	int num;
	int mask;
	int run;
	int port;

	buff[0] = '.';
	b = buff;
	strcpy (buff + 1, in);

	if (buff[1] == '.')
		b++;

	addr = 0;
	mask = -1;

	while (*b == '.')
	{
		b++;
		num = 0;
		run = 0;

		while (!(*b < '0' || *b > '9'))
		{
			num = num * 10 + *b++ - '0';

			if (++run > 3)
				return -1;
		}

		if ((*b < '0' || *b > '9') && *b != '.' && *b != ':' && *b != 0)
			return -1;

		if (num < 0 || num > 255)
			return -1;

		mask <<= 8;
		addr = (addr << 8) + num;
	}

	if (*b++ == ':')
		port = Q_atoi (b);
	else
		port = net_hostport;

	hostaddr->sa_family = AF_INET;
	((struct sockaddr_in *) hostaddr)->sin_port = htons ((short) port);
	((struct sockaddr_in *) hostaddr)->sin_addr.s_addr = (myAddr & htonl (mask)) | htonl (addr);

	return 0;
}
//=============================================================================

int WINS_Connect (int socket, struct qsockaddr *addr)
{
	return 0;
}

//=============================================================================

int WINS_CheckNewConnections (void)
{
	char buf[4096];

	if (net_acceptsocket == -1)
		return -1;

	if (recvfrom (net_acceptsocket, buf, sizeof (buf), MSG_PEEK, NULL, NULL) > 0)
	{
		return net_acceptsocket;
	}

	return -1;
}

//=============================================================================

int WINS_Read (int socket, byte *buf, int len, struct qsockaddr *addr)
{
	int addrlen = sizeof (struct qsockaddr);
	int ret;

	ret = recvfrom (socket, (char *) buf, len, 0, (struct sockaddr *) addr, &addrlen);

	if (ret == -1)
	{
		int errnum = WSAGetLastError ();

		if (errnum == WSAEWOULDBLOCK || errnum == WSAECONNREFUSED)
			return 0;

	}

	return ret;
}

//=============================================================================

int WINS_MakeSocketBroadcastCapable (int socket)
{
	int	i = 1;

	// make this socket broadcast capable
	if (setsockopt (socket, SOL_SOCKET, SO_BROADCAST, (char *) &i, sizeof (i)) < 0)
		return -1;

	net_broadcastsocket = socket;

	return 0;
}

//=============================================================================

int WINS_Broadcast (int socket, byte *buf, int len)
{
	int ret;

	if (socket != net_broadcastsocket)
	{
		if (net_broadcastsocket != 0)
			Sys_Error ("Attempted to use multiple broadcasts sockets\n");

		WINS_GetLocalAddress ();
		ret = WINS_MakeSocketBroadcastCapable (socket);

		if (ret == -1)
		{
			Con_Printf (PRINT_DEFAULT, "Unable to make socket broadcast capable\n");
			return ret;
		}
	}

	return WINS_Write (socket, buf, len, &broadcastaddr);
}

//=============================================================================

int WINS_Write (int socket, byte *buf, int len, struct qsockaddr *addr)
{
	int ret;

	ret = sendto (socket, (char *) buf, len, 0, (struct sockaddr *) addr, sizeof (struct qsockaddr));

	if (ret == -1)
		if (WSAGetLastError () == WSAEWOULDBLOCK)
			return 0;

	return ret;
}

//=============================================================================

char *WINS_AddrToString (struct qsockaddr *addr)
{
	static char buffer[22];
	int haddr;

	haddr = ntohl (((struct sockaddr_in *) addr)->sin_addr.s_addr);
	sprintf (buffer, "%d.%d.%d.%d:%d", (haddr >> 24) & 0xff, (haddr >> 16) & 0xff, (haddr >> 8) & 0xff, haddr & 0xff, ntohs (((struct sockaddr_in *) addr)->sin_port));
	return buffer;
}

//=============================================================================

int WINS_StringToAddr (char *string, struct qsockaddr *addr)
{
	int ha1, ha2, ha3, ha4, hp;
	int ipaddr;

	sscanf (string, "%d.%d.%d.%d:%d", &ha1, &ha2, &ha3, &ha4, &hp);
	ipaddr = (ha1 << 24) | (ha2 << 16) | (ha3 << 8) | ha4;

	addr->sa_family = AF_INET;
	((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl (ipaddr);
	((struct sockaddr_in *) addr)->sin_port = htons ((unsigned short) hp);
	return 0;
}

//=============================================================================

int WINS_GetSocketAddr (int socket, struct qsockaddr *addr)
{
	int addrlen = sizeof (struct qsockaddr);
	unsigned int a;

	Q_memset (addr, 0, sizeof (struct qsockaddr));
	getsockname (socket, (struct sockaddr *) addr, &addrlen);
	a = ((struct sockaddr_in *) addr)->sin_addr.s_addr;

	if (a == 0 || a == inet_addr ("127.0.0.1"))
		((struct sockaddr_in *) addr)->sin_addr.s_addr = myAddr;

	return 0;
}

//=============================================================================

int WINS_GetNameFromAddr (struct qsockaddr *addr, char *name)
{
	struct hostent *hostentry;

	hostentry = gethostbyaddr ((char *) & ((struct sockaddr_in *) addr)->sin_addr, sizeof (struct in_addr), AF_INET);

	if (hostentry)
	{
		Q_strncpy (name, (char *) hostentry->h_name, NET_NAMELEN - 1);
		return 0;
	}

	Q_strcpy (name, WINS_AddrToString (addr));
	return 0;
}

//=============================================================================

int WINS_GetAddrFromName (char *name, struct qsockaddr *addr)
{
	struct hostent *hostentry;

	if (name[0] >= '0' && name[0] <= '9')
		return PartialIPAddress (name, addr);

	hostentry = gethostbyname (name);

	if (!hostentry)
		return -1;

	addr->sa_family = AF_INET;
	((struct sockaddr_in *) addr)->sin_port = htons ((unsigned short) net_hostport);
	((struct sockaddr_in *) addr)->sin_addr.s_addr = * (int *) hostentry->h_addr_list[0];

	return 0;
}

//=============================================================================

int WINS_AddrCompare (struct qsockaddr *addr1, struct qsockaddr *addr2)
{
	if (addr1->sa_family != addr2->sa_family)
		return -1;

	if (((struct sockaddr_in *) addr1)->sin_addr.s_addr != ((struct sockaddr_in *) addr2)->sin_addr.s_addr)
		return -1;

	if (((struct sockaddr_in *) addr1)->sin_port != ((struct sockaddr_in *) addr2)->sin_port)
		return 1;

	return 0;
}

//=============================================================================

int WINS_GetSocketPort (struct qsockaddr *addr)
{
	return ntohs (((struct sockaddr_in *) addr)->sin_port);
}


int WINS_SetSocketPort (struct qsockaddr *addr, int port)
{
	((struct sockaddr_in *) addr)->sin_port = htons ((unsigned short) port);
	return 0;
}

//=============================================================================
